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net/mlx4_core: Fix use of ENOSPC around mlx4_counter_alloc()

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When ENOSPC is set the idx is still valid and gets set to the global
MLX4_SINK_COUNTER_INDEX.  However gcc's static analysis cannot tell that
ENOSPC is impossible from mlx4_cmd_imm() and gives this warning:

drivers/net/ethernet/mellanox/mlx4/main.c:2552:28: warning: 'idx' may be
used uninitialized in this function [-Wmaybe-uninitialized]
 2552 |    priv->def_counter[port] = idx;

Also, when ENOSPC is returned mlx4_allocate_default_counters should not
fail.

Fixes: 6de5f7f6a1 ("net/mlx4_core: Allocate default counter per port")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tariq Toukan 2020-05-04 11:36:02 +03:00 committed by David S. Miller
parent bea0c5c942
commit 40e473071d
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ethernet/mellanox/mlx4/main.c
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@ -2550,6 +2550,7 @@ static int mlx4_allocate_default_counters(struct mlx4_dev *dev)
if (!err || err == -ENOSPC) {
priv->def_counter[port] = idx;
err = 0;
} else if (err == -ENOENT) {
err = 0;
continue;
@ -2600,7 +2601,8 @@ int mlx4_counter_alloc(struct mlx4_dev *dev, u32 *idx, u8 usage)
MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
if (!err)
*idx = get_param_l(&out_param);
if (WARN_ON(err == -ENOSPC))
err = -EINVAL;
return err;
}
return __mlx4_counter_alloc(dev, idx);